Introduction: Textile industry is the second largest environmental pollutant right after oil industry. It works in an almost completely linear way, from making clothing from non-renewable natural sources, to waste textiles, of which the majority ends up in landfills or incinerators. The new approach of the circular system of the textile industry aims to make the textile industry more sustainable, reducing its negative environmental and human impacts, from raw material production to textile waste treatment. Purpose: In the master's thesis we investigated the quantities of textile waste, the share of clothing in this textile waste collected by the Humana company in the City of Ljubljana and their raw material composition in order to understand the textile waste management system, as well as the related possibilities and barriers to recycling. Methods: We designed the work on the basis of a descriptive method in reviewing publications and prepared a set of best technological and non-technological approaches for reducing quantity of textile waste. In the second part of the study, we performed a sieve analysis of textile waste collected in Humana containers in the City of Ljubljana. Sampling took place for 5 consecutive months. Each month, a representative sample was taken from the total amount of textile waste collected. The representative sample was first separated into waste clothing and other textile waste, which was examined for its intended use. The waste clothing was further quartered to a smaller sample in which the raw material composition was then determined. Results: During the sampling of textile waste we found that waste clothing is predominant in comparison to other textile waste. In other textile waste there were mainly shoes, handbags, and toys. Waste clothing is dominated by mixed raw material composition. The fewest garments were made from plastic-based fibers. Based on the results, we have prepared a set of practices and approaches that would best prevent the loss of material value of textile products and would make sense to introduce them into Humana's business processes. Discussion and conclusion: The raw material composition of waste clothing in Humana containers in the City of Ljubljana depends on the seasonal change of household clothing and the age of the garment. Containers are mainly dominated by garments of mixed raw material composition, The increase in the proportion of waste garments of mixed raw material composition among textile waste is due to the addition of elastane. In order to reduce the amount of textile waste at landfills and incinerators, it would make sense to upgrade Humana's business processes and, above all, to change consumer patterns of over-buying.
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